There are lots of ways she could make money. Not only has she sold over 10M albums WW but she tours a lot. She just finished a festival tour where she was listed as the headliner. I'm sure she got paid a ton each show.
It's not like she's just buying homes everywhere. She likely sold her last few to be able to buy these ones.
Either way get real estate queen
Get inspired by your new home and release a new album.